using toolchain

[Anas Alzouhbi]

Hello!
I read the document of toolchain on:http://wiki.openmoko.org/wiki/Toolchain
I arrived until this command:
"    *  Extract it directly as root, so use command "su" first (or
prefix the tar command with "sudo" when you are using Debian/Ubuntu):

  cd /
  tar -xjvf ~/sources/openmoko-XYZ-arm-linux-gnueabi-toolchain.tar.bz2
"
I don't understand what I have to write in command exactly, I'm
working on Debian
but I runned this command: sudo tar -xjvf
~/sources/openmoko-XYZ-arm-linux-gnueabi-toolchain.tar.bz2
 but I obtained this error:
tar: /root/sources/openmoko-XYZ-arm-linux-gnueabi-toolchain.tar.bz2 :
la fonction open a échoué: Aucun fichier ou répertoire de ce type
tar: Erreur non récupérable : arrêt du traitement
tar: Child returned status 2
tar: Des erreurs ont provoqué l'arrêt du programme